Retro-reflector



FIG. 1 is a perspective view of a retro-reflector, showing my new design;

FIG. 2 is a is a front view thereof;

FIG. 3 is a left side view thereof; and,

FIG. 4 is a top plan view thereof.

Figures for a right side view and a bottom view thereof are omitted as they are symmetrical to the left side view and the top plan view thereof respectively. 

CLAIM I claim, the ornamental design for a retro-reflector, as shown and described. 